What is the best treatment for continued pain and swelling after a knee artrhoscopy? physiotherapy was advised, but not possible now due to covid-19.

Keep moving: Even without formal physical therapy, you can do gentle exercises at home. These keep the blood circulating to reduce swelling & stiffness. Here are some exercises that may help: https://orthoinfo.aaos.org/en/recovery/knee-arthroscopy-exercise-guide/ Consult your doctor if you have significant pain that limits your ability to perform these exercises or swelling & pain in the calf below your knee